Two men severely beaten in unprovoked assault-Were there warning signs? Unlisted Video

Two men outnumbered and beaten by four males in an unprovoked attack. Were there any signs that these men planned to jump these two men before being severely beaten? Is it legal to draw a gun on someone that approaches you aggressively? Here to discuss that as well as media stories that supports doing so

News story links below
DA clears man that shot and killed suspect at the Trax station.
https://kutv.com/news/local/man-who-shot-2-people-on-trax-platform-ruled-justified-prosecutors-say
Ogden men attacked by four men in an unprovoked assault
https://www.ksl.com/article/51204183/4th-man-charged-in-random-vicious-attack-at-ogden-gas-station